Nice art and sounds. Loved it! A nice font and working a bit more on the menus would make it a look even better!

Finally, somebody who gets it.  A true sorcerer only needs one stat: INT - and one spell: the highest damage one that exists.  I'm so tired of these weak ass wizards who want to multi class or learn 20 spells and whine about not having enough MP to cast Ultima.  Posers, all of them.  And don't even get me started on those warrior clowns with their big stupid swords.

I gave this 5 stars on everything but "fun" which I put 4 on because....

- The staff felt a bit tedious, I think it's window for hit should be taller and maybe wider as if you miss it, you die and restart, and it can be a bit hard to tell if you are at the right height for your attack to land, especially when jumping.

- The changing of the enemy movement is a neat idea and adds a puzzle element, but it also felt slightly tedious after a while. Maybe just because it's tied to the staff and the staff is a bit hard to use.

- Dying in one shot feels bad for the character when you have to replay a lot of the level.  For a short game like this it's ok but I think a health bar or checkpoint system would be needed for a game with more levels.

I love the presentation here. It is very reminiscent of Megumin from Konosuba, if you haven't seen that show already, you should check it out (the original, not the spinoff lol).  It shows how the presentation can add just as much fun to the gameplay, sure killing stuff is fun, but it's twice as fun when there is a choir behind you and a tubular bell.

What I really liked - 

- exploring to get the power felt really good, getting the yellow pieces

- when you actually get the shot, it feels good and i like the idea of having to one-shot everything on screen as the win condition, I would just work on making it feel as fun and less like tedium as possible.  Like maybe switches instead of having to hit them with your staff.  Something less prone to missing, since it's a puzzle game, the difficulty is in the strategy, not in the mechanics, and when you combine both, it can be frustrating if you already solved the puzzle in your head but keep dying because you missed an attack.  I dunno. 

I think you've got a really fun concept that will appeal to a lot of people and could be a good streaming game if you nail the blend between the puzzle solving, fun and the concept of the all powerful wizard.  you are very close already, but I think some extra love and some extra levels and monsters/mechanics etc. will get you to a full game that could do well on Steam if priced right :)  You could take this concept and have different playable characters as well who "one-shot" in different ways or solve the same level in different ways.  

PS